Network Analyst: Route is generated with NaN (not a number) measure values

Description

When solving a route using Network Analyst, the output route is a measured polyline, but all vertices have measure values of NaN, not a number.

Cause

There are non-zero impedance values on either the junctions or turns in the network. When a route contains these impedances, it is not possible to create a polyline with measure values indicative of the elapsed impedance along the length of the route.

Workaround